snyder



(No Model.)

L. H..SNYDER. SPEAKING TUBE ATTACHMENT FOR TELEPHONES. N0. 463,556. Patented Nov. 17, 1891.

%afmaeo Rama w" W lea/2Z0 flsnyder ww w UNITED STATES PATENT OFFICE.

LEONDO ll. SNYDER, OF SHARON, PENNSYLVANIA.

SPEAKING-TUBE ATTACHMENT FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 463,556, dated November 17, 1891.

Application filed January 28, 1891, Serial No. 379,471. (No model- To aZZ whom it may concern:

Be it known that I, LEONDO H. SNYDER, a citizen of the United States, residing at Sharon, in the county of Mercer and State of Pennsylvania, have invented certain new and useful Improvements in Speaking-Tube Attachments for Telephones and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improved speaking-tube attachment for telephone-transmitters; and it consists of a device which can read ily be adjusted to telephonetransmitters of any ordinary or special construction, and by means of which the sound of the voice is not only largely increased, but is at the same time concentrated at the required point within the telephone. This device, which I choose to term asound amplifier and concentrator, is of very simple construction, 0011* sisting merely of a straight tube, one end of which is provided with a suitable mouth-piece, while the other end is adapted to enter and cover or surround the transmitter of thetelephone. Vithin this straight tube I provide a diaphragm placed near its front end and a diaphragm or concentrator placed ashort distance from the end of the tube entering or covering the telepholie-transmitter, the end or apex of said concentrator coming in close proximity to the transmitter. From either side of this straight tube, and connected therewith, is a curved tube of smaller diameter and of about one-half the capacity of the straight tube, leading from a point immediately in front of the front diaphragm to points directly opposite to the diaphragm or concentrator at the rear end of the said straight tube.

The construction and the object of the device Will be more clearly understood by ref erence to the accompanying drawings, in wl1ich-=- Figure 1 is a horizontal section, Fig. 2, a side elevation showing the device attached to the transmitter; Fig. 3, plan view of the clamp by means of which the device is secured to the telephone.

Referring to said drawings, a represents the mouth-piece Z), the straight tube within which the diaphragm c and the diaphragm or concentrator d are placed.

6 c are curved tubes leading from the diaphragm c to the diaghragm or concentrator (Z. The tubes are constructed preferably of brass, but may be of any other suitable material. The diaphragins may be of japanned sheetiron, sheet-brass, or other like material.

t' represents a flange intended to cover the round hole or opening inclosing the transmitter of the telephone, and through which flange the end of the tube b projects until it reaches and covers said transmitter. This flange is also provided with a collar g, which encircles the tube b, and is provided with a set-screw 7L, by means of which the tube 12 can be adjusted and secured at any desired proj ection through said flange and the apex f of the concentrator (Z be adjusted and secured at any'desired distance from the transmitter.

The object of my invention is to overcome the difficulties experienced from vibration, caused by the direct action of the voice on the transmitter, which occurs to a greater or less extent in all telephones in which straight tubes or funnels are in use. This difficulty is entirely overcome by my invention through the peculiar arrangement of the diaphragm c and the diaphragm or concentrator (Z (Z, in combination with the curved tubes e c. The theory of this combination, and its utility is clearly demonstrated in practice, is that in talking into the mouth-piece a, the voice striking the diaphragm c, the sound or vibration of air causing the sound is divided and passes through the curved tubes 6 6 until it reaches the sides of the diaphragm or concen trator cl, the result being an amplification of the sound and at the same time a concentra tion of the same at the exact point of transmission undisturbed by the vibration and confusion caused by the use of direct tubes or funnels.

Having fully described my invention, what I claim, and desire to secure by Letters Pat ent, is

1. A speaking-tube attachment for a tele= phone-transmitteig consisting of a straight tube adapted to enter and cover the transmitter, a curved diaphragm in said tube near the front end, and a V-shaped diaphragm in the siieithe diaphragm (I, an adjustable collar '1 carried upon the straight tube for adjusting the end of the tube to the transmitter, and suitable means for securing the attachment tube near the transmitter, and two or more curved tubes connected to said straight tube and leading from points in front of the curved diaphragm to points opposite the V-shaped diaphragm, substantially as described. in place, substantially as described.

2. In a speakingtube attachment for tele- In testimony whereof I affix my signature in phones, the straight tube 1), having a suitable I presence of two Witnesses. V i'nout-h-piece, the diaphragms c and (I, located LEONDO H. SNYDER.

in said tube, and curved tubes 6 e, eonnectin g Witnesses: with the straight tube and leading from points A. V. VILLIAMS, in front of the diaphragm c to points 0pp0 I. A. HIGGs. 

